From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F6C0E8305D for ; Tue, 3 Feb 2026 07:07:57 +0000 (UTC) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id A7BD840648; Tue, 3 Feb 2026 08:07:49 +0100 (CET) Received: from mail-dy1-f177.google.com (mail-dy1-f177.google.com [74.125.82.177]) by mails.dpdk.org (Postfix) with ESMTP id 3EE9C402EF for ; Tue, 3 Feb 2026 08:07:47 +0100 (CET) Received: by mail-dy1-f177.google.com with SMTP id 5a478bee46e88-2b4520f6b32so9367935eec.0 for ; Mon, 02 Feb 2026 23:07:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770102466; x=1770707266; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=bbOiC9tOovJ6pBfMGbcBVFH9C7Z3D8BopdtjFOYmFCw=; b=ERNSMh3NKE9rvCdvO60HJ3cL6f7ywfbIh3DXmPaOwDISzIlq5vsiIsD9BExgTh/wi5 4RxSKPw79WyfP7ki+cjwDzQp1VAeZPVw11sqTaDCkw4kvOqCV9BAKR86Jx+F0hgpSfF5 us4EklbPC0Is1mOd2Hy/O0J80z2q524D4Hxl85Dho5Bu5vfFQH5geofl9v6IfeOrSG8F VoHPiX9rBxZ6HHtpfFOUgEVXW/680eYThfRaF5zvJT7trZ5mVwm8+WckQKshbDq+qv3L KmA349TQ3HfrMjyIz/yS59dHiDVIIEhOLXgCpuLiYVsesWCXwZaiRxL55BPAoIZZyY+m fldw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770102466; x=1770707266; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=bbOiC9tOovJ6pBfMGbcBVFH9C7Z3D8BopdtjFOYmFCw=; b=qLg1dJUKbFVFAuCseR02y12Lv54wI6C4EW6saXada5kNS20XXw9Aj42KaZBOJoO2TJ FMLKEDk1aJbRxisjrt7VVWMVbxnpUfPAXhOCJTRy9c9QUz4TnGg7V3ZRm0RAU0534QZB UKkyNlKTlvPokPhXM9exerPOmZ7F2CN7ltW0LRi2R5vXb2IqBz8XTewOKxtcSCEqBchQ Ta+nSMg9+zEgcC7tjHKzonA3S74tfjFJ8UEJrfhL7NBw80/oSDkk2cf8IHpYTEE38DPN ngMf6g960u92PFU7AjpQCnIB3BRlJQK4m1YsleJGh9ff7ubKag5gnOoWQg095Ds5Q8Wu p+Iw== X-Gm-Message-State: AOJu0YxYZIs1hkU0hDvDtoduifNMhtRSBr5QAfAutL96oFoStEiVk0IY 2pEbFM0F58qZbozY/Pr48DZK8NVkxtUVmefp4zNMXEaOrUOuqZbAdghy6QyyBw== X-Gm-Gg: AZuq6aKQ5NtczRmACyVBFGaNy2a9QR2APheuvvsM5pLQeOUXHVU25J6t8tHXtz911Lg bkylqemWmNEJTg8EuA26/lXD3E4Nvte1AIwXGmwihe4Ybm+y2jcu719r+Yhehinuf8CciFWtBlj 6BZZXmbCDmZrdtCSh8ZDVqHRGuhRv7gNGgFeqyjYWjTWhH/3d0c2XsWCM4vTBa24O+NbWClBTOb EYYa4PStNiHo2en27uJAJEERBBK25lMqccZTdHDAjgG4NDZN0vLpG2x/vPKNOZXrlAB/m1Iiu20 EqkPoFNkv0A/PDdw46ZVczjDrZDTk14cez/PS/R7BTl3uo4tGQCpdY/+G3JnCTZfry6YrtdeVV6 e09Ve0up6A3r+g2XMqXw1sx7RZ2X8ZqNEhrZEl9xFP+zU45FwsY7937rDWxRynhAQiNitbxECSw BBzMux9lqbn1Wraos1mRHUfZMQsJ3bfBgL X-Received: by 2002:a05:7300:e7ab:b0:2b6:fa0c:6c44 with SMTP id 5a478bee46e88-2b7c86485f8mr5938243eec.12.1770102465994; Mon, 02 Feb 2026 23:07:45 -0800 (PST) Received: from mac.com ([136.24.82.250]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2b7a16cfaa8sm21073318eec.4.2026.02.02.23.07.45 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 02 Feb 2026 23:07:45 -0800 (PST) From: scott.k.mitch1@gmail.com To: dev@dpdk.org Cc: stephen@networkplumber.org, Scott Mitchell Subject: [PATCH v5 2/4] net/af_packet: RX/TX bulk free, unlikely hint Date: Mon, 2 Feb 2026 23:07:38 -0800 Message-Id: <20260203070740.62305-3-scott.k.mitch1@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260203070740.62305-1-scott.k.mitch1@gmail.com> References: <20260202081456.4322-1-scott.k.mitch1@gmail.com> <20260203070740.62305-1-scott.k.mitch1@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org From: Scott Mitchell - Use rte_pktmbuf_free_bulk() in TX path instead of individual rte_pktmbuf_free() calls for better batch efficiency - Add unlikely() hints for error paths (oversized packets, VLAN insertion failures, sendto errors) to optimize branch prediction - Remove unnecessary early nb_pkts == 0 when loop handles this and app may never call with 0 frames. Signed-off-by: Scott Mitchell --- drivers/net/af_packet/rte_eth_af_packet.c | 41 ++++++++--------------- 1 file changed, 14 insertions(+), 27 deletions(-) diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c index d0cc2c419a..51ac95ff5e 100644 --- a/drivers/net/af_packet/rte_eth_af_packet.c +++ b/drivers/net/af_packet/rte_eth_af_packet.c @@ -161,9 +161,6 @@ eth_af_packet_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) uint32_t tp_status; unsigned int framecount, framenum; - if (unlikely(nb_pkts == 0)) - return 0; - /* * Reads the given number of packets from the AF_PACKET socket one by * one and copies the packet data into a newly allocated mbuf. @@ -261,9 +258,6 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) uint32_t num_tx_bytes = 0; uint16_t i; - if (unlikely(nb_pkts == 0)) - return 0; - memset(&pfd, 0, sizeof(pfd)); pfd.fd = pkt_q->sockfd; pfd.events = POLLOUT; @@ -271,24 +265,17 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) framecount = pkt_q->framecount; framenum = pkt_q->framenum; - ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base; for (i = 0; i < nb_pkts; i++) { - mbuf = *bufs++; + mbuf = bufs[i]; - /* drop oversized packets */ - if (mbuf->pkt_len > pkt_q->frame_data_size) { - rte_pktmbuf_free(mbuf); + /* Drop oversized packets. Insert VLAN if necessary */ + if (unlikely(mbuf->pkt_len > pkt_q->frame_data_size || + ((mbuf->ol_flags & RTE_MBUF_F_TX_VLAN) != 0 && + rte_vlan_insert(&mbuf) != 0))) { continue; } - /* insert vlan info if necessary */ - if (mbuf->ol_flags & RTE_MBUF_F_TX_VLAN) { - if (rte_vlan_insert(&mbuf)) { - rte_pktmbuf_free(mbuf); - continue; - } - } - + ppd = (struct tpacket2_hdr *)pkt_q->rd[framenum].iov_base; /* * poll() will almost always return POLLOUT, even if there * are no extra buffers available @@ -312,6 +299,9 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) pbuf = (uint8_t *)ppd + ETH_AF_PACKET_FRAME_OVERHEAD; + ppd->tp_len = mbuf->pkt_len; + ppd->tp_snaplen = mbuf->pkt_len; + struct rte_mbuf *tmp_mbuf = mbuf; do { uint16_t data_len = rte_pktmbuf_data_len(tmp_mbuf); @@ -320,23 +310,20 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) tmp_mbuf = tmp_mbuf->next; } while (tmp_mbuf); - ppd->tp_len = mbuf->pkt_len; - ppd->tp_snaplen = mbuf->pkt_len; - /* release incoming frame and advance ring buffer */ tpacket_write_status(&ppd->tp_status, TP_STATUS_SEND_REQUEST); if (++framenum >= framecount) framenum = 0; - ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base; - num_tx++; num_tx_bytes += mbuf->pkt_len; - rte_pktmbuf_free(mbuf); } + rte_pktmbuf_free_bulk(&bufs[0], i); + /* kick-off transmits */ - if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1 && - errno != ENOBUFS && errno != EAGAIN) { + if (unlikely(num_tx > 0 && + sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1 && + errno != ENOBUFS && errno != EAGAIN)) { /* * In case of a ENOBUFS/EAGAIN error all of the enqueued * packets will be considered successful even though only some -- 2.39.5 (Apple Git-154)